Pro Git (Chinese version) http://git.oschina.net/progit/

It is said to be the simplest introductory tutorial on git in history. I personally think it is a relatively comprehensive introductory tutorial and is recommended

"pro git" is the best

Getting Started:
A concise guide to git (the author is very careful, like it) → http://rogerdudler.github.io/git-guide/index.zh.html

A little more detailed to basically meet daily use:
git community book → http://gitbook.liuhui998.com/

Official website information:
pro git → http://git-scm.com/book/zh

http://www.liaoxuefeng.com/wiki/0013739516305929606dd18361248578c67b8067c8c017b000

Agree with git pro upstairs

Share the very good git learning and introductory resources I have collected:
Git Magic
Git Immersion
git ready

Tutorial written by a Chinese, especially suitable for beginners:

http://www.liaoxuefeng.com/wiki/0013739516305929606dd18361248578c67b8067c8c017b000

Simple introductory tutorial: http://teliute.org/mix/Tegit/index.html

《ProGit》

Illustrated Git